Well it has expired. We were able drilling without any problems. Cutting debris if there is a spring I may not clog large minute diameter only effective short amount than the length of the hole saw (part of the interior of the core is sticking out toward the cutting edge) Noto base is reinforced because through work is 100 points on our side, because I think it is a fire ant whether is cruel to ask up there for this product.

It was used for the drilling of the general purpose of the aluminum case. Sharpness is often great to cheaper than those made by other companies, which had been purchased at home improvement until now.
Durability does not know yet early days for, but also I think to buy.